Apologies for what's probably quite simple, but I'm having some problems with
sorting a data frame by the number of occurences of each level of a factor.
df<-data.frame(id=c(1:20),name=c('a','b','b','c','a','d','b','e','d','d','c','a','b','a','a','b','f','b','c','g'))
I want to sort the dataframe so that the values of df$name that occur most
often are at the bottom - ie. in the order:
attributes(sort(summary(df$name)))$name = "e" "f" "g" "c" "d" "a" "b":
> sort(summary(df$name))
e f g c d a b
1 1 1 3 3 5 6
So the desired result is:
id name
8 e
17 f
20 g
4 c
11 c
19 c
6 d
9 d
10 d
1 a
5 a
12 a
14 a
15 a
2 b
3 b
7 b
13 b
16 b
18 b
Any suggestions would be greatly appreciated.
Thanks.
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